bbb bbc bbe bbm bbo bbs bbt bcb bcc bce bcm bco bcs bct be- beb bec bee bem beo bes bet bmb bmc bme bmm bmo bms bmt bob boc boe bom boo bos bot bsb bsc bse bsm bso bss bst btb btc bte btm bto bts btt c-- cbb cbc cbe cbm cbo cbs cbt ccb ccc cce ccm cco ccs cct ce- ceb cec cee cem ceo ces cet cmb cmc cme cmm cmo cms cmt co- cob coc coe com coo cos cot csb csc cse csm cso css cst ctb ctc cte ctm cto cts ctt ebb ebc ebe ebm ebo ebs ebt ec- ecb ecc ece ecm eco ecs ect eeb eec eee eem eeo ees eet em- emb emc eme emm emo ems emt eo- eob eoc eoe eom eoo eos eot es- esb esc ese esm eso ess est etb etc ete etm eto ets ett m-o mbb mbc mbe mbm mbo mbs mbt mc- mcb mcc mce mcm mco mcs mct meb mec mee mem meo mes met mmb mmc mme mmm mmo mms mmt mob moc moe mom moo mos mot msb msc mse msm mso mss mst mtb mtc mte mtm mto mts mtt ob- obb obc obe obm obo obs obt oc- ocb occ ocm oco ocs oct oeb oec oee oem oeo oes oet om- omb omc ome omm omo oms omt oo- oob ooc oom ooo oos oot os- osb osc ose osm oso oss ost ot- otb otc ote otm oto ots ott sbb sbc sbe sbm sbo sbs sbt scb scc sce scm sco scs sct se- seb sec see sem seo ses set smb smc sme smm smo sms smt sob soc soe som soo sos sot ss- ssb ssc sse ssm sso sss sst stb stc ste stm sto sts stt tbb tbc tbe tbm tbo tbs tbt tcb tcc tce tcm tco tcs tct te- teb tec tee tem teo tes tet tmb tmc tme tmm tmo tms tmt to- tob toc toe tom too tos tot tsb tsc tse tsm tso tss tst ttb ttc tte ttm tto tts ttt